Home Planning Long-Term Transmission Service Request

Long-term Transmission Service Requests

Transmission linesMISO serves as a transparent and neutral facilitator for transmission service planning, resulting in fair and open access to the region’s transmission system. Market Participants and transmission customers may initiate long-term firm transmission service (one year or longer) through MISO's OASIS. Our Transmission Service Planning Group reviews all long-term firm transmission service requests and notifies customers about their preliminary disposition.   

Reports and Studies

Studies help MISO determine whether new long-term firm transmission services requests will cause new constraints or aggravate existing constraints on the MISO’s transmission system or non-MISO transmission systems. Requests that undergo System Impact Studies or Facilities studies have corresponding reports posted on MISO's OASIS.

System Impact Studies (SIS)

System Impact Study reports provide detailed analysis of the impact of the requested service on MISO and non-MISO transmission systems as well as potential upgrade options and estimates of their associated costs.

Facility Studies

Customers who want to pursue a transmission service request after seeing the results of the System Impact Study may require a Facility Study. During this stage, customers get more accurate cost estimates and schedules for finishing the transmission upgrades.

Transmission Service Requests

Module B of the MISO Tariff provides primary terms and conditions for scheduleing rights (SR). This and other Tariff attachments and schedules, as well as related business practices manuals (BPMs), guide MISO’s processes for analyzing, approving and rejecting transmission service requests. Easily navigate these Tariff parts using the links below or visit the Tariff page


Module B - Transmission Service
Find an outline of transmission provider responsibilities and  prerequisites for transmission customers requesting transmission service, including FERC Order 890 compliance information.

BPM 020 - Processes, Procedures and Models
Section 5 describes the business practices and procedures used to evaluate long-term firm transmission service requests.

Specification Sheets
All confirmed long-term TSRs require a signed copy of the spec sheets prior to acceptance.

TSR Study Report
We post final study report to our OASIS site.

MISO TSR Modeling FTP Site
Request access to TSR study models via the access request form on the Client Relations page. 

Use the links below to download Tariff Attachments relevant to Long-Term Transmission Service. For another easy way to navigate Tariff parts and see their relationships to BPMs and committees, go to the Tariff. 

Attachment A includes the following relevant sections and exhibits:

  • Attachment A-1: Service Agreement for Long Term Firm Point-to-Point Transmission Service
  • Exhibit 1 of Attachment A-1: Transmission Specification Sheets for Long Term Firm Point-to-Point Transmission Service (Sometimes referred as spec sheets.)

Attachment D comprises the methodology for completing a System Impact Study as well as:

Attachment F includes the Service Agreement for Network Integration Transmission Service. In the the exhibit you will find the Transmission Specification Sheets for Network Integration transmission Service.

Attachment G comprises the Network Operating Agreement for Network Integration Transmission Service

Attachment J describes the timelines for processing Transmission Service requests for Transmission Providers and Transmission Customers.

Use the links below to download Excel spreadsheets with Rate Schedules relevant to Long-Term Transmission Service. You also may find these schedules on OASIS.

Ancillary Service Pricing 
The "ANC_SERV_1_PRICING" tab at the bottom of the spreadsheet provides rates for Scheduling, System Control and Dispatch Service.

The second tab, "ANC_SERV_2_PRICING" provides rates for Reactive Supply and Voltage Control.

Point-to-Point Transmission Service Rates 
Download this spreadsheet from OASIS. Rates are updated regularly.

Frequently Asked Questions

Transmission Service customers need to make all requests using OASIS.

Yes. Transmission customers and Market Participants may register to request transmission service on OASIS. Visit the Market Participation page to learn how to gain access to OASIS.


After you request long-term firm transmission service on OASIS, MISO will notify you via comments on OASIS.

MISO only charges for the cost of the study; therefore, any remaining balance after the study is completed, cancelled or withdrawn is returned to the customer.

MISO will send a System Impact Study Agreement within 30 days after receiving the transmission service request on OASIS.

MISO must finish the System Impact Study within 60 days.

If the results indicate an acceptable transmission service request without requiring transmission upgrades, then the customer must submit two copies of the transmission specification sheets within 15 days of MISO’s request. If the results indicate that there are overloads that need to be fixed before service can be granted, then the transmission customer is offered a Facility Study Agreement.

The customer needs to submit spec sheets within 15 days after MISO’s request on OASIS.

MISO will automatically retract the request from OASIS.

After the System Impact Study report is posted, Midwest ISO will e-mail a Facility Study Agreement within 30 days.

A customer has 15 days to execute the Facility Study Agreement and send the $100,000 study deposit.

MISO will refuse the transmission service request on OASIS. 

No. According to Attachment J, MISO will be in violation of the Tariff if it accepts an agreement after 15 days.

Yes. MISO only charges a customer for the actual cost of the study. MISO will return any remaining balance after completing and closing the Facility Study.

MISO has “and” pricing; therefore customers must pay both charges in addition to other charges depending upon the transmission service.

No. The customer is required to submit the eDNR form along with the spec sheets before MISO can grant service on OASIS.

Yes, with the exception of PJM. If the point-of-receipt or point-of-delivery is PJM, then MISO requests that the customer notify us when PJM’s results are available. Once the customer notifies MISO, we will require the customer to submit two copies of the spec sheets within 15 days.

According to FERC Order 890, in order to be considered for rollover rights, the transmission customer must submit a transmission service request with at least a five-year term and give a one-year notice for renewal. Please check the posting on OASIS for more details.

Yes. The rollover right need to be transferred to the redirected TSR at the time of submission.

No, MISO does not provide conditional firm service.